Enable reproducible archives

ci/compare-build-results.sh

@@ -0,0 +1,53 @@
+#!/usr/bin/env bash
+
+# This is a simple script to check if builds are reproducible. The steps are:
+# 1. Build Hibernate Reactive with `./gradlew --no-daemon clean publishToMavenLocal --no-build-cache -Dmaven.repo.local=some-path/out/build1`
+# 2. Build Hibernate Reactive with `./gradlew --no-daemon clean publishToMavenLocal --no-build-cache -Dmaven.repo.local=some-path/out/build2` second time pointing to a different local maven repository to publish
+# 3. Compare the build results with sh ./ci/compare-build-results.sh some-path/out/build1 some-path/out/build2
+# 4. The generated .buildcompare file will also contain the diffscope commands to see/compare the problematic build artifacts
+
+outputDir1=$1
+outputDir2=$2
+outputDir1=${outputDir1%/}
+outputDir2=${outputDir2%/}
+
+ok=()
+okFiles=()
+ko=()
+koFiles=()
+
+for f in `find ${outputDir1} -type f | grep -v "javadoc.jar$" | grep -v "maven-metadata-local.xml$" | sort`
+do
+  flocal=${f#$outputDir1}
+  #  echo "comparing ${flocal}"
+  sha1=`shasum -a 512 $f | cut -f 1 -d ' '`
+  sha2=`shasum -a 512 $outputDir2$flocal | cut -f 1 -d ' '`
+  #  echo "$sha1"
+  #  echo "$sha2"
+  if [ "$sha1" = "$sha2" ]; then
+    ok+=($flocal)
+    okFiles+=(${flocal##*/})
+  else
+    ko+=($flocal)
+    koFiles+=(${flocal##*/})
+  fi
+done
+
+# generate .buildcompare
+buildcompare=".buildcompare"
+echo "ok=${#ok[@]}" >> ${buildcompare}
+echo "ko=${#ko[@]}" >> ${buildcompare}
+echo "okFiles=\"${okFiles[@]}\"" >> ${buildcompare}
+echo "koFiles=\"${koFiles[@]}\"" >> ${buildcompare}
+echo "" >> ${buildcompare}
+echo "# see what caused the mismatch in the checksum by executing the following diffscope commands" >> ${buildcompare}
+for f in ${ko[@]}
+do
+  echo "# diffoscope $outputDir1$f $outputDir2$f" >> ${buildcompare}
+done
+
+if [ ${#ko[@]} -eq 0 ]; then
+    exit 0
+else
+   exit 1
+fi

hibernate-reactive-core/build.gradle

@@ -80,6 +80,15 @@ dependencies {
     testImplementation "org.testcontainers:oracle-xe:${testcontainersVersion}"
 }
 
+// Reproducible Builds
+
+// https://docs.gradle.org/current/userguide/working_with_files.html#sec:reproducible_archives
+// Configure archive tasks to produce reproducible archives:
+tasks.withType(AbstractArchiveTask).configureEach {
+    preserveFileTimestamps = false
+    reproducibleFileOrder = true
+}
+
 // Print a summary of the results of the tests (number of failures, successes and skipped)
 def loggingSummary(db, result, desc) {
     if ( !desc.parent ) { // will match the outermost suite